/**
 * Type guard for a real ShadowRoot, used to ensure style injection never targets
 * `document.head`/`document.body` (which would break Shadow DOM style isolation).
 * @param {unknown} value - The candidate value.
 * @returns {boolean} True when the value is a ShadowRoot.
 */
export declare const isShadowRoot: (value: unknown) => value is ShadowRoot;
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